Device for feeding air to locomotive and other furnaces.



PATENTED JUNE 11, 1907.

J. MILTON. DEVICE FOR FEEDING AIR TO LOGOMOTIVE AND OTHER FURNACES.

APPLICATION FILED JAN 15, 1907.

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JOHN MILTON, OF WVASI'IINGTON, DISTRICT OF COLUMBIA.

DEVICE FOR FEEDING AIR TO LOCOMOTIVE AND OTHER FURNACES.

Specification of Letters Patent.

' Patented June 11, 1907.

Application filed January 15, 1907. Se al 11 352,427.

To all whom/ it iii/my concern:

Be it known that I, JOHN MILTON, a citizen of the United States, residing at Washington, District of Columbia, have invented certain new and useful Improvements in Devices for Feeding Air to Locomotive and other F urnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in fire boxes of boilers of the locomotive type.

The object of my invention is to provide the fire box with means whereby the combustion of the fuel will be completed in the fire box and boiler tubes whereby the gases and smoke forming elements are consumed in the furnace.

I/Vith these objects in view, my invention consists in providing a fire box, in which the ordinary brick arch is used, with means for de livering air into the fire box above the arch and in the rear of the front edge of the arch.

Referring to the drawings wherein I show one embodiment of my invention and wherein the same part is designated by the same reference numeral wherever it occurs, Figure 1 is a central longitudinal section of a locon1o tive fire box showing my invention applied thereto. Fig. 2 is a horizontal section of Fig. 1, taken above the arch and air supplying device. Fig. 3 is a detail longitudinal section of an air supplying pipe, and, Fig. 4 is a cross section of the construction shown in Fig. 3.

1 designates an ordinary fire box of the 10- comotive type and provided with an ordinary form of brick arch 2, which is shown as being supported by the ordinary arch pipes 3.

4 designates the air pipe which extends from one side of the fire box to the other and which is located in the space above the arch and behind, the front edge thereof as clearly shown in Fig. 1. This pipe extends through the sides of the boiler and preferably at each end is provided with suitable air inlets 5. I also provide means to force air into the pipe such, for instance, as the steam jet 6, there being a jet located adjacent each end of the pipe.

In order to protect the pipe 4 from the action of the intense heat of the furnace, I inclose the same in a water pipe 7 which is connected with the water space of the boiler at each side of the fire box.

The waterpipe 7 is of suflicient diameter to accommodate the air pipe and have ample space around the latter for the circulation of the water. The connections between the pipes for the passage of the air from the inner pipe to the interior of the fire box are made by means of lugs or ribs 8 which are preferably castwith said pipes, and openings or passages 9 are made through the pipes and the connecting lugs or ribs as shown. In practice, I prefer to cast the inner and outer pipes and the connecting lugs or ribs together in order not only to obviate the necessity of screw joints, but to provide for a uniform expansion and contraction throughout. I may use one lug for each hole or by making the lugs of greater length, two or more holes can be made therein; or if desired the lugs or ribs may extend the entire length of the space occupied by the line of holes. Where the holes or perforations are drilled or otherwise formed there is solid metal from the outside or water pipe to the inside of the inner or air pipe and consequently screw joints are entirely obviated. Preferably and as shown, the pipes Within the fire box are enlarged so as to increase the strength of the pipe and also to increase the area of the surface from which the air is distributed.

10 designates a pipe which is connected at one end to the water pipe 7 and at the other to the crown sheet 11 of the boiler. This pipe operates to increase the rapidity of the circulation through the pipe 7 The location of the air supply pipe about half way between the top of the arch and the crown sheet and behind the forward edge of the arch enables air to be supplied to the fire where it is most necessary and where it has heretofore been wanting. The result of supplying air to the fire across the width of the fire box at this point is to enable all the air to be supplied which is required for the 001m plete combustion of the smoke which would otherwise be lost through the stack.

My construction is very cheap to manufacture, easy to install in any locomotive fire box, and will not readily or quickly burn out and when it does, can be readily replaced.

\Vhile I have described what I believe to be the preferred form of my invention, I deshe to have it understood that many changes may be made in the form, construction and arrangement of the parts without departing from the spirit of my invention.

WVhat I claim as new and desire to secure by Letters Patent is:

1. The combination with a boiler furnace of the locomotive type having an arch, of a perforated air supply pipe extending across the furnace and located between the arch andv the crown sheet and behind the forward edge of the arch, whereby the products of combustion after passing over the forward edge of the arch entirely surround the air supply pipe and are divided thereby, the perforations in the air supply pipe being so located as to feed air into the space above and below the pipe across the paths of the products of combustion.

2. The combination with a boiler furnace of the locomotive type having an arch, of a perforated air supply pipe extending across the furnace and located between the arch and the crown sheet and behind the forward edge of the arch, whereby the products of combustion after passing over the forward edge of the arch entirely surround the air supply pipe and are divided thereby, the perforations in the air supply pipe being so located as to feed air into the space above and below the pipe across the paths of the products of combustion, said air supply pipe being provided with a water jacket.

3. The combination with a boiler furnace of the locomotive type having an arch, of a perforated air supply pipe extending across the furnace and located between the arch and the crown sheet and behind the forward edge of the arch, whereby the products of combustion after passing over the forward edge of the arch entirely surround the air supply pipe and are divided thereby, the perforations in the air supply pipe being so located as to feed air into the space above and belowthe pipe across the paths of the products of combustion, a water pipe surrounding said air supply pipe, said water pipe extending into the water space of the boiler at each side of the furnace.

4. The combination with a boiler furnace of the locomotive type having an arch, of a perforated air supply pipe extending across the furnace and located between the arch and the crown sheet and behind the forward edge of the arch, whereby the products of combustion after passing over the forward edge of the arch entirely surround the air supply pipe and are divided thereby, the perforations in the air supply pipe being so located as to feed air into the space above and below the pipe across the paths of the products of combustion, a water pipe surrounding the air supply pipe, said water pipe extending into the water space of the boiler at each side of the furnace, and a pipe connecting the water pipe with the crown sheet.

In testimony whereof I afi ix my signature, in presence of two witnesses.

JOHN MILTON. 

